Typo corrections (thanks @jsavatgy)
Merge branch 'just-asciidoc' of /home/ubuntu/sites/yesodweb.com/content/book/tools/../..
applications -> application's

Grammar correction.
Merge commit '6db09b83d9d08a5f18db549bdb42b2905a66a221'
Merge branch 'just-asciidoc' of /home/ubuntu/sites/yesodweb.com/content/book/tools/../..
Merge commit 'b15259bd691d4eafe24252a485b6841449acc09d'